Those are people who want to trade them. Since invisibility is pretty easy to get ahold of, I say go ahead and combine I just did mine, actually. It makes the pin last longer.
I guess it depends on the pin. I like combining some pins (I have 5 star invisible, fireworks, and pirates), but see no point in combining teleport. Dancing Inferno and Magic Carpet also may be better combined IMO. If you can get multiple pirates, storm, or treasure now you might as well combine them IMO, since you can not trade them.
However there is another viewpoint that was once explained to me. I once saw a character that was wearing 8 fireworks pin and it said she would not trade them in her description box. I asked her why she was wearing so many of the same type of magic pins, but wouldn't trade them. Her answer was that by using as few as 5 of the pins one after the other she had a virtually unlimted fireworks magic spell where my 5 star pin only gave me a long fireworks spell that had to be followed by a short recharge time.
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